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http://dx.doi.org/10.7234/kscm.2011.24.6.007

Effect of Urethane Modification on the Anti-Bullet Property of Dyneema/vinylester Composites  

Yoon, T.H. (광주과학기술원 신소재공학과)
Cha, Y.M. (광주과학기술원 신소재공학과)
Yuck, J.I. (국방과학연구소)
Paik, J.G. (국방과학연구소)
Oh, Y.J. (국방과학연구소)
Kim, H.J. (삼양컴텍 연구소)
Publication Information
Composites Research / v.24, no.6, 2011 , pp. 7-11 More about this Journal
Abstract
Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema$^{(R)}$/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema$^{(R)}$ fabric at 21 % resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at $100^{\circ}C$ for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 layers and cured at $120^{\circ}C$ for 5 min under the contact pressure and for additional 25 min at 150 $kg/cm^2$. Finally, the anti-bullet properties of composite samples were evaluated by measuring $V_{50}$ with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of $V_{50}$ with UP127 and EB8200, respectively.
Keywords
polyurethane oligomer (PUO); Dyneema; vinylester; anti-bullet test; flexural strength; impact strength;
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